Hi, I'm having a few problems with my Prelude (92 model with 93 H22A1 and five speed tranny.)

First, it's been running real rich lately. I've taken it to a specialist that analyzed it on the computer, and they couldn't find anything wrong with it. I changed the oxygen sensor in it anyway, and it did nothing. Any advice on what this might be would be helpful.

Next, whenever I let off of the gas pedal, and press in the clutch pedal, the car will try to idle at about 2k rpm. I can hit the gas pedal quickly, and it'll rev up and go back down.

Last, My check engine light keeps throwing the Knock Sensor code, but it only does it when the car is at idle temp. From what I can tell, the sensor is still plugged up, and should be in working order since it is fairly new. Maybe this problem is something wrong with the timing???